McDonnell & Miller 343500 Bellows Assembly

When you are servicing a 64 Series low water cut-off, the McDonnell & Miller 343500 Bellows Assembly (Model SA64-2) is the standard-issue component required to restore essential boiler safety functions. This authentic replacement bellows assembly is engineered for heavy-duty steam boiler control, specifically bridging the gap between the internal float mechanism and the electrical switch. As a direct-fit part for 64 Series LWCO and 764 models, it features a robust bracket design that ensures precise mechanical transmission. Field reliability is paramount; a failing bellows can lead to sluggish switch actuation or system leaks. Utilizing this genuine McDonnell & Miller SA64-2 component preserves the hydraulic integrity of the control unit while maintaining factory-spec response times. For contractors managing low water cut-off parts inventory, this assembly is indispensable for preventing dry-fire conditions and ensuring the float-operated control remains responsive under varying pressure levels within the boiler chamber.

• Precise Mechanical Alignment: The integrated bracket ensures a seamless connection between the float rod and the switch head for immediate actuation.
• Engineered for Series 64/764: Purpose-built for the 64 Series, eliminating the need for field modifications and reducing labor time during service calls.
• Industrial-Grade Construction: Built to withstand the thermal and mechanical stresses of high-cycling steam environments.
• Leak Prevention: High-integrity bellows design provides a reliable seal, protecting sensitive electrical components from steam and condensate.

• Is this assembly compatible with older No. 64 models? Yes, the SA64-2 is the standard replacement bellows for both current and legacy 64 and 764 series low water cut-offs.
• Does this include the float or switch? This is the bellows assembly and bracket only. For a full rebuild, the float and switch must be inspected or ordered separately.
• Why is my bellows failing prematurely? Common causes include excessive sediment buildup in the float chamber or extreme pressure spikes beyond the rated capacity of the 64 Series control.

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Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.